Flexible flask



FIG. 1 is a perspective view of a flexible flask showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in FIGS. 1 through 6 are understood to represent conventional stitching. 

The ornamental design for a flexible flask, as shown. 